Petaluma, California 

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Climate in Petaluma, California

Petaluma, California gets 30 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Petaluma averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 260 sunny days per year in Petaluma. The US average is 205 sunny days.

Petaluma gets some kind of precipitation, on average, 75 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 84 degrees
Winter Low: the January low is 39
Rain: averages 30 inches of rain a year
Snow: averages 0 inches of snow a year


The annual BestPlaces Comfort Index for Petaluma is 8.4 (10=best), which means it is more comfortable than most places in California.

9.4 / 7.2

Summer   /   Winter
June, August and July are the most pleasant months in Petaluma, while January and December are the least comfortable months.

Climate Averages
  Petaluma, CaliforniaUnited States
  29.8 in.38.1 in.
  0.0 in.27.8 in.
  74.8 days106.2 days
  260 days205 days
  30 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Petaluma with an average high temperature of 83.7°, which ranks it as cooler than most places in California. In Petaluma, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Petaluma are October, June and May.

In Petaluma, there are 28.1 days annually when the high temperature is over 90°, which is cooler than most places in California.

December has the coldest nighttime temperatures for Petaluma with an average of 38.3°. This is about average compared to other places in California.

In Petaluma, there are 16.7 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Petaluma, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

Humidity in Petaluma is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.

December is the wettest month in Petaluma with 5.7 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 57% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 29.8 inches in Petaluma means that it is wetter than most places in California.

January is the rainiest month in Petaluma with 12.5 days of rain, and July is the driest month with only 0.2 rainy days. There are 74.8 rainy days annually in Petaluma, which is rainier than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 2% chance of a rainy day.

There is rarely any recorded snowfall in Petaluma, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Petaluma.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Petaluma    16 Reviews
    Old hippies are in charge - 9/6/2021
    I agree with the low star reviews. Been here for 25 years, raised a family and seen everything turn to the left and worse. Weather is glorious, love the old Victorians... Read More

    Start Your Review of Petaluma

    A great place to call home, if you can afford it - 7/1/2021
    We’ve lived here for 3 years and we love it. It has taken some time to grow on us. We moved from SF where we had lived over 15 years, we were not used to one year leases... Read More

    California living at its finest! - 3/28/2021
    I’ve lived here a couple of years (after living in others parts of the Bay Area for 15+ years) and I love it! Great neighborhoods, friendly folks, good schools with... Read More

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